I also gave this scene a 4. Paul looked great as usual. Dimitri looked very good and is off to a promising start as a newbie. At the moment of truth shortly before and during ejaculation, I was really impressed by Dimitri's size. He's packing some serious heat once he's really aroused. lol
I have a few comments and suggestions for Johnny's consideration here, as much as for possible responses from other members. I usually find having the models start fake kissing immediately at the very beginning of a scene...to be a buzzkill. Speaking for myself, I don't think it necessarily ruins a whole scene. (Though sometimes it will knock a scene out of 5 star contention for me.) Nonetheless it usually (IMO) tends to start a scene off with a flat and uninspiring tone. If anything it actually slows down the momentum and pace of a scene in the viewers' eyes, rather than kicking it off and propelling the momentum forward. Especially so if it looks like they are just mentally crossing off a box on the checklist of things they're supposed to do. If I perceive that to be the case, then the models and director are already having to play catchup to regain and retain my interest from that point on.
What would I suggest to do in place of that? I would probably urge you not to have models start kissing until some sexual excitement has begun and the kissing seems more congruous to the unfolding action. Even if the kissing is still somewhat fake and forced, it will always have a better chance of being compelling to viewers if it occurs at a more appropriate moment. That's not to say that some kissing that's more passionate and less forced cannot carry the beginning of a scene. Sometimes it can and has.
I do foresee another possible scenario for kissing at the beginning of a scene if it's done differently. If there is to be kissing at the very beginning of a scene (with newbie straight models especially), let the models start kissing while they are still clothed. But... Let them embrace each other while kissing (probably best captured on film if done in a standing position) and have them running their arms, hands and fingertips around each other's torsos. A short makeout session as it were, rather than just a quick robotic pecking of the lips. Sometimes fingertips will glide more easily across clothing than bare skin to get the desired effect. Sometimes running hands and fingertips underneath clothing can be a trigger for moaning and closing of the eyes. If you can capture that moment while kissing when fingertips gently running along the back, spine or ribcage cause a guy to shudder and quiver with the combination of ticklishness and sexual thrill...you'll know you've scored with viewers.
I'm not criticizing Paul or Dimitri here. They did a very good job. As far as the kissing, they were only doing what they were told to do in the scene.